ex1 = "couch surfing"
ex2 = "couch_surfing"
ex3 = "COUCH SURFING"
ex4 = "COUCH_SURFING"
ex5 = "couchSurfing"
ex6 = "couch Surfing"
ex7 = List("swimming", "reading", "couch surfing")
ex8 = List("couch surfing", "COUCH_SURFING")
ex9 = List("couch surfing", "other")
ex10 = "couchSurfing"
ex11 = "min"
ex12 = "gb"
